Black Book protects itself from a grenade.

>>LIVE GRENADE DETECTED<<

At seemingly the same instant, Rarity gasped. “Grenade!”

Ponies began to scatter, running into each other, not knowing where to go.

Rarity’s magic flared around her satchel, opening it.

Beams of colored light shot out from the twin magical energy turrets which had descended from the ceiling. They struck a pony in the crowd, turning her into a burning pink silhouette of whomever she had been.

My host looked down, scanning the floor, her actions seeming unbearably slow. I mentally shouted for her to duck for cover, but she seemed transfixed. Her eyes fell on the metal apple not two yards from her desk. The dark bulk of a large, open book fell down over it, and four white hooves jumped on top.

The Book!

In an instant:

A flash of fire and swirling magical energy underneath the book,
A cracking sound that left a buzzing silence in its wake,
A rippling of explosive force that threw Rarity back.

My host stumbled, disoriented, a ringing in her ears. Everypony was shouting, but their voices seemed muffled and far away.

I spotted The Black Book. It had landed next to Rarity, smoking but undamaged.

I felt conflicting waves of horror and relief. How could any book survive smothering a magical energy grenade? What kind of book was this? And yet… thank the stars that it wasn’t hurt. That book was dangerous, but it was valuable! Just looking at it, I knew how useful it must be…

Fallout Equestria: Chapter 32